I am looking for a way to do fast KNN queries on a dataset of 10+ million 3D points (and growing). I was hoping PostGIS would do the trick with its new and operators, but they don't seem to work in three dimensions. Does anyone know any workarounds that would extend the KNN GiST index to 3D? Right now I'm using a "normal" spatial index with the &&& operator, but that creates all the issues that led to the addition of the KNN index in the first place.
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